Glassware working apparatus



Aug; 21, 1945. E. E. SLICK GLASSWARE WORKING APPARATUS 5 Sheets-Sheet 1Original Filed Feb. 17 1936 INVENTOR Aug. 1945 E. E. SLICK GLASSWAREWORKING APPARATUS 5 Sheets-Sheet 2 7 Original Filed Feb. 17, 1935INVENTOR Aug. 21, 1945. E. E. SLICK 4 I GLASSWARE WORKING APPARATUS oriinal" Filed Feb; 17, 1956 V 5 Sheets-Sheet s a I: l

MUM v L Aug. 21, 1945. E. E. SLICK GLASSWARE WORKING APPARATUS OriginalEiled Feb. 17; 1956 5 Sheets-Sheet 4 2% MJW Aug. 21, 1945. E, E. SLICK-GLASSWAREWORKING APPARATUS Original Filed Feb. 17, 1936 I s'she ts-sneet5 MAM simplifies EQliltIGLy I I .1.A, stilliurther object otmy inventionhas been .to provide an article forming machinewhich is Patented Aug.21, 1945 2,383,349 I I GLASSWARE WORKING APPAR TUS" Edwin E. slickPittsburgh, Pa. Continuation of application Serial No. 64,227,

February 17, 1936. This 1940,, Serial No. 337,545 (CL 49-5) 9 Claims.

This invention pertains to improvedfprocedure fo (ia ry ng out glasswaremakingpperationsand t apparatus employed in connection therewith, andmore particularly, to improved procedure for shaping articles while inmotion. Thoseskilled n this particular art know v that the. sic-calledimprovements in. glassware making or shaping apparatus have innosensebrought about a simplification. ofthe procedure and of themechanisms employed. On theother hand, the mecha- -I nisms haveincreased in complexity of designand intri a votoperaticn. a. I

. ,In view; of the above considerations, it has been an object of myinvention to providea new and m e simn ware. H

II have foundthat the new development in the art. of forming glasswarehav notv only added to the complexity of; the. apparatus and theintricacy of... the operations, but havealso made the in:-

I ed procedure for forming glassstallation and maintenance costs. oflayout almostprohibitive from the standpoint-of the small I operator. I

,Ithasflbeen. anotherfiolojectsof my invention to utilize an entirelynew principle. in a glassware making proceduresuchthatthe efliciency ofoneration will be increasedand th-at many intricate features may beeliminated, and that a; more eiieotive control I of the formingoperations may behad. I

. Another object, or myinvention has been to obtain thewdesirableteatures oi a mechan-ically- I operated forming apparatus without.incorporatingtheundesirable features. j i

.Atwrther object. has been to provide a me- I chaniealbtcompact.glassware making unit which oapableoi effectively handling a continuousfluid stream-flower molten materialand which will. handlesueh materialma. smooth, positive, and

efiectivemanner. I

,These and many other 1Figure l is; a topplamj v-iew oi an apparatusembodying the I features of my invention;

Figure 2.- is a. sidexclevatiorr partially in section and taken alongthe linelII -ll of Figure 1;

Figure 3 is an enlarged. sectional elevation- .taken along the line;KE-J11 or Figure 1.;

Figure tiisla horizontal section taken alon thejline IVE-5W or 71 3:; NI I .yFigiureg 5.; is1 a vertical elevation of an or core mticmo Isertmninr i urahr.

a distributor valve shown in j .6wisa fragmentalsection takenenthelineyv'h vlof Figures; I I H I I I I I I objects of my invention willappear to] thoseiskilledinthe art from the following description takenin; view of the claims another appendeddrawings of which e applicationMay 27,

Figure '7 is a top plan View of the lower portion of apparatusillustrated in Figures. 1 and 12 and showing a fiu-id reservoir;

Figures .8. and9. are. fragmental sections taken along the. linesVIIIVIII and. IXIX, respectively, of Figure 7;

Figure 10: is an enlarged top. plan detail of a shear mechanism shown inFigures 1 and 2;

j Figure 11 is a sectional elevation. taken along the line XIXI ofFigure 10,;

Figure. 12 is a sectional detail of linkage for operating shears ofFigures, 10 and 11; and

Figure 13 is a pressure-time curve showingthe economy of hydraulically,forming articles in accordanoe withiny invention.

I have found that I can effectively handle molten glass having a highfluidity and which is fed as a continuous stream fromthe fore-.

hearth or orifice of a furnace and can do this without controlling orinterrupting the flow of the stream in the manner heretofore thought tobe necessary. I I have also, been able to carry out the temperature,the. head of glass, and the vol- I the actual shaping operations with asmooth efficiency and with a more complete control of the steps,involved. H

In accordance with the principles of my invention, I have provided a.glass forehearth having a suitable feed orifice and a stationary butadjustable flow control needle or other suitable means. That is, Iprovide a needle which may be set at a certain position in accordancewith ume of it. which is to be fed ,throughthe orifice. During theactual operation of the machine, however, this needle remains stationaryafter its 1 position has been set for conditions such as outlined above.I

I have also provided a suitable driving mechanism forcontinuouslyturninga rotatable table which carries a plurality ofradially-positioned I I mold. cups.

The mechanism drives a stationmounted pair of shears which are alinedwith I the orifice to quickly cut or separate the correct I amount ofglass for each mold cup as. the glass .flows out of such orifice.

The number of cups, their paths of movement, as well as their speed ofmovement, are controlled so that as a portion of the glass isseparatedor cutoff with a lighthing-like action, it immediately dropsinto and is.- received by a moving mold which at that instant is in thepath of the drop. Of course,v

the proportioning willv besuch that there is always a mold in positionfor receiving a glass portion when out or separated, although the streamitself is continuous, has a high heat, and thus, is fluid rather thanviscous. The speed of the cup movement. and of the, glass flow areadjusted to give the desired shape and size of the separatedglassportion, I i I I-believe that I have been the first to effecthatimmediately after cutting, the separated portions are reheated and shearmarks eliminated;

this feature being of very great importance. An- I other advantage isthat the forming operations are accomplished with greatly increasedeconomy.

The problem involved in successfully employing a continuous fluid streamof glass is not limited to the provision of a suitable number of cupswhich are progressively moved to receive each separated portion of thestream, but also involves the provision of forming mechanism whichprogressively, quickly, and surely forms a good quality article, anddoes it in such a manner as to leave time enough for the article orblank to be discharged from its mold cup, for the mold cup to cool, andthen to move to a position to receive a new charge. By solving theseproblems, I have not only been'ab-le to utilize a new method of glassfeed, but have also been able to form quality ware at a new high rate ofproduction.

In order to carry out the forming operations while the mold cupscontinuously rotate, I provide each cup with an individual pressingmechanism whose operation is timed in such a manner that sureness,quickness, and smoothness of forming action has been attained, and thepower required for the forming operations has been cut down to an extentheretofore thought to be impossible while still properly controlling thesteps of the forming operations. I

The mold cups are adapted by cam track or other suitable means to movein and out with respect to their rotative axis in order that each cupwill receive a glass portion or gather at its out position, and willreceive a pressing plunger at its "in position to form an article orblank.

In connection with the forming operations, I have embodied an entirelynew principle which results in amarked increase in efliciency,particularly from the standpoint of smoothness of operation and ofeconomy of power. This principle comprises the employment of a liquid orsome other relatively non-compressible fluid, such as Water or oil as adirect acting actuating hydraulic medium for each of the individualpressing mechanisms. 'When I speak of a hydraulic medium or a hydraulicfluid, I have particular reference to an incompressible material ofliquid form such as water, oil, etc. I have found that the lag whichnormally'accompanies the pneumatic or air type of plunger action isentirely eliminated, and this is very important in view of the necessityfor an extremely speedy forming operation as required by the continuousstream feed of the molten glass. The positiveness, sensitiveness, andeffectiveness of a mechanical camrning action are obtained Without theconsequent loss in control. The postiveness and smoothness of the actionas controlled by asuitable valve system is indeed remarkable.

Further, in accordance with the principles of my invention, I haveprovided a piston to which a former or a blank presser is attached. Thepiston is hydraulically actuated in its forming stroke and ispneumatically actuated on its return stroke by the counter pressure of acompressible fluid. This compressible fluid is forced out of one end ofthe piston chamber into a closed extension chamber or accumulator by thepiston during its forming stroke. Thus, energy of the forming stroke'isstored and later utilized to return the piston and the attached blankformer to its tributes to the power lost.

original position. The flow of hydraulic fluid to and from the pistonchamber is automatically controlled by a distributor valve which is, inturn, controlled by the rotation of the carrier and its associated moldcups. The hydraulic fluid is supplied to the valve, and thus, to thevarious forming mechanisms in such a manner that the pressure isautomatically and practically instantaneously adjusted to the powerrequirements of each step of the operation of a given forming mechanism.As a result, the saving in energy and power is enormous, see the curveof Figure 13.

It is also true that a better control is had of the steps involved informing a given blank or article; for example, the pressure used to movethe former to a cooperating position with a mold cup is approximatelythat required to'overcome friction, see a of Figure 13. The pressureused to actually form or press out a blank in the mold cup is of a muchhigher value, see b. Such pressure is later backed off by the valve tofinish the operation. The build up of pressure is automatic; it buildsup as the need arises in a manner similar to the action of an electricmotor when a load is applied. A relief valve prevents a build up ofpressure beyond desired limits, and thus, prevents damage if, forexample, foreign matter was accidentally introduced into a mold cup.

A pin valve mechanism controls the release or exhaust of the hydraulicfluid from the piston chamber to cause the-counter-pressure to at firstslowly move the former ofi the blank, and then,-

out the forming operations of my invention isrelatively small since itis only utilized as required. As distinguished from this, a pneumaticsystem utilizes substantially the same amount of energy duringpreliminary and return movements of the piston as when the associatedplunger is actually forming an article in a mold cup. The lag whichaccompanies the use of a compressible fluid in the forming stroke of apiston also con- I obtain the power economy and quick-action of amechanical system, but on the other hand, obtain a simplicity and aneffectiveness of control of the steps of formingan article which areimpossible with a mechanical system.

In the curve of Figure 13, time has been plotted as an abscissa, sincepower is a function of it, and pressure has been plotted as an ordinate.Unlike the pneumatic system which isconnected to a large tank located ata distant point and in which compressed air is maintained at its highestwork value for moving a presser during both its forming and returnstrokes, it shows that pressure is applied and proportioned in my systemonly in accordance with the actual requirements of the system. Theperiod of time represented by 0 pact unit which may be moved from placeto place or from forehearth to forehearth as needed.

vDuring the starting up operation,' I can continuously rotate themachine to pick up and dis- .sles n tiehs until the sues ree h t eeatehis. an pwa d y e tendin se t lumh 1 .5 fii hhut w ich ar 11 r time .iamiss arteries terl tete- 1A sui hle d ea or able I nt e s s the .e shlur lup r exe l s r h me Per-hen H. eh is te tithe ryi ei time; sat-siermmber Q.- een the e he 1 l? i Jewel d hen a. light l e he solemn. 5; bybeen 1 1 Whieh are. ure? t th ew s z hsnttiesrreh s igrqrnovab e flamel. w t Figure. l sweets hens it have a in t s mo abl a ut eutivardl he..nstthe times re s ehshis with the ii hh a sati h sh is me ted W W heme11:1 thi m hhe each 5; mo e o a dly ere ive to th righ t F ur 2 t F u e1 ehcll h n ma a-stst 1 Gerri 1m he qeerstie th h QQQQIILPHSQM- Eachrreisr hlr pr vided, w th a abl t ehi h l9: he a 'e eh ihe ada ted he rde n Mam. ash ex en ar re h h Ihe 1 w l b weeh daisq and: c ar n a eh het it eat track there itiqhet sta qn A, m erdert eha t pe .QWf Qi; w ieht rm d art cl l st sr 6s mol emi sq le i- T'fhe up r ear-he mem e 130 ismeuhteel t removably secured "to and which supports anesr member 6. thatthe 1 s o ti theme er ie hih m e s ismlis mo nted di e ly in alinementwith an associated cup l5 when that cup has been moved to its innerposition onits carrier in; and, since both the upper and lower carriers30 and. H) are. connected together, it will appfiar that. they rotate insynchronism and that the pressing mechanism is always ready foroperating upon a gob in the mold cup. i In order to strengthen the uppercarrier 31] an to hold it in the proper spaced relationship with respectto the lower carrier I0, I have provided a plurality of verticallyextending positioning rods .42 which are screwed into the lower carrierand are bolted to the upper carrier. A drip pan 43 is removably mountedto extend between t e chamberedvalve housing 33 and the upper ends ofthe piston chambers 4 I.

. Referring particularly to Figure 3, it is seen that I plunger 5.8 hasan upper flange or annulus 44 that abuts a slide head; 45, both of whichare removably mounted. on a threaded extension portion of the connectingrod 40. The slide head 45 moves witht in a housing cap 46, and anarticle edging annulus s l jehs fiklla b ad ust d to v ert hs. w lr sn gu re t s lura st .ei nhi b shh t tm he. m eh sm 31...in th s de e mehani i r vid dst eel. the w tha su able e ess ri Pressure connected to"a valve-housing chambers m h 3. ti hhis retsts l J'ehrneled by he r 1ishesh rmme me ha m at e er ses 2 esuit es, s

ts. velume hd-h e h. hy e s see she; ceiving the next successive charge,

41 is bolted to a lower flan e of the hou p 6 to limit the maximumdownward movement of plunger 01'- former 3.8.. A pair of disc-likeplates 48 areadjustably mounted on rod to control the compression of aspiral positioningspring 49. This. spring 49 rmally maintains the pp rnd ofthe slide head in abutment With thei-nner top wall of the housingcan 46. Figure 3 shows that slide head 451s. a its lo e position wh heor er 3B i pressin o t. b ank; att e ei th arrangement prevents injur tothe appa atus. t pr mer mav me t. or th Pr se or i he 3 isobstructed.

The len th of-s re e o the ass. as is s i ab y adiust d by ue s es t whh are rea ed enroeszfi that zst nelt i m t e a er 301w. e operate withplates. 4%. Th sun It eem r s at h r t on h hireh st red Z0. which. e-she th thre -h. a. menthe s ee e 2- memorably mount ssm h- 1 e s seshle for i p s n The operating mechanjsn torrotating the carriers titand sh-may be of ui ab e e m su mete .1 nre j eti with t ble Qlutch s1,5mm dr e g a ,3; As ee 2- .theh h heannu1us, 1-2. or H is qtided; withan out r ear o l hsh s a d s.. -ri n. b t es .iee e me heh sm own ncudes. a o

hearth 5A hay ng a refractory orifice 55, positionhev s s 1. 2 and he iht hl e ht e needle Sinc ear -rin c m h ti nl u z a continuous stream ofahot liquidslik glass 58 as distinguished from an interrupted stream ofset flow st t he slej 5- s pre i 't d es f i he ed 1pm. th temperat re ithe glass;

tzlwi l; e ap a e t tha upp y a co u us srhvi y fiow sf: fluit 'er m lteele swh s ate i the ha e central ethod of: fe d n r it low f: e moltenclass is not pe i d a l huem ted or retard d bra. re ip roe l-u ger orrotating bell tofi lim shapeder W r in my inv n io h ars y n eptw th utubs n a ly b sh. the up ersr The time s i te ruptieh s slifii e Pe mit sares to. e; r c i d new we teh p esented tar ieass, i s on necessar p mer y My ad ust d: y the t p r or need e Figures 2 and'll.

For separating the stream into charges, I pros vide a suitable shearmechanism WhlCh has a vertically extending column 59 mounted upon the.stationary frame I. Adjacent'the top of the column 59,I have mounted aremovable cap 59a upon which is supported the operating mechanism of theshears. The shear operating mechanism includes a pair of shear blades 60and 60a pivotally mounted on a shank 60' by suitable bolt means BIwhich, at its lower end, is bolted to an extension of the cap member5911. Each sheer blade at its rear end is provided with twooppositely-positioned outwardly-projecting tabs 62 and 63; and actuatinglinks 64 and 65 are pivotally connected to the tabs by studs 66 and 6'!for moving the blades to open and closed positions. The links 64 and 65are pivotally connected together at a common point by a cam-rollersupport-stud 68 upon which is alsomounted cam roller '69, as well as apositioning arm E0. The positioning arm I is pivot-- ally mounted on thestationary cap member 59a at its other end by a stud II. A spiral springI2 is connected between the arm I0 and the cap 59a for normally holdingthe arm cam roller 69 tightly against a rotating cam disc I3. A spiralspring I6 resiliently holds the blades 60 and 60!: on shaft 60.

I have also provided a trip cam for holding the shear or scissor bladesin their closed position, independently of the operation of the cam 13;this trip cam comprises a finger lever I4 pivotally mounted on thestationary cap portion 59a and having a cam'face I adapted to abut thearm and press it outwardly away from the op:- erating' cam I3. As shown,the actuating cam disc I3 is centrally axled to a vertical operatingshaft II which is journaled by suitable bearings I8 within the cap 59aand the column 59. A lubricating cup BI is shown in Figure 11. Beneaththe cam disc I3 is a rotatable plate I9 keyed to shaft 11 and havingbolts 80 extending upwardly therefrom} The cam I3 may be moved to theextent of the slots shown in Figure 10, for adjusting the cuttingoperation of the shears to the proper timed relationship with respect tothe rotation of the drive shaft 11.

The shear mechanism is driven in a timed relationship with respect tothe rotation of the carrier members I0 and 30, since it is driven by thering-gear annulus-membe I2, see particularly In this connection, I haveprovided a suitable gear 82 meshing with the ring gear I2 and keyed to arotating shaft 83, upon one end of which is keyed a suitable gear 84which meshes with a chain of pinions 85 and 86. The chain of pinions inturn meshes with a small gear 81 keyed to the drive shaft 11.

For carrying out the forming or pressing operations, I have provided, asshown particularly in Figures 1, 2, '7, 8, and 9, a suitable reservoir Ifor hydraulic fluid, such as water or oil, a pair of rotary pumps 90 and9| connected in parallel and driven by motors 92 and 93. The pumps 90and 9| have a suction line 94, a valve 95 for controlling the flowtherethrough, a relief line 96 and an'automatic relief valve 91. Apressure line 98 is connected to a vertical pipe 98' which extendsupwardly through the central column 5 of the machine. The numeral 99represents a suitable pressure gauge. Of course, both the relief line 96and the suction line 94 enter the reservoi I. The inside of the column 5acts as an exhaust line for forming mechanisms 3|, since it is connectedat its lower end by a pipe 8 to a reservoir I, see Figure 2. i a

The control mechanism includes a'distributin valve I00 mounted at thetop of the central column 5, see particularly Figures 2, 3 to 6,inclusive. This valve comprises a base portion IOI removably secured tothe column 5 by suitable bolt means I02. The base IOI has an annulusportion I02 adjacent its upper face for supporting the lower bearing 34.A central core portion I04 rests upon, is keyed to and extends above thebase portion IOI. It has a cap member I05 secured thereto by bolt meansI 06 and locked with respect thereto by extensions I01 and pinsIIl8. Thecap portion I05 is grooved to receive the upper bearings 34 and therotary outer chamber housing portion 33. As seen, the chamber housing 33extends between the upper and lower bearings 34 and rotates about thecentral core portion I04. i T

In Figures 3, 4, 5, and 6, I have shown the operation of the valve. Thechamber housing member 33 is provided with the same number of chambersI09 as there are pressure cylinders II, and each of these chambers isconnected'by a telescopic pipe I I0'to itsrespective piston cham-* ber.In Figure 3, the pressure line is shown connected directly to thecylinder 4| and the plunger 38 is forming an article A in the mold thevalve, while the chambers immediately adjacent the chamber I09a which isreceiving the hydraulic fluid are completely shut on from any flow,except that the chamber I091) is connected by suitable passageway H2 andII3'to the exhaust II I the flow through these passageways is controlledby an adjustable needle valve II4, see particularly Figure 6. That is,when the chamber I09a is receiving pressing fluid, the chamber I091) hasbeen cut off from any pres si ing fluid and has been slightly opened tothe exhaust, in order that an accumulator'mechanism which will behereinafter described, can slowly initiate a return mo'vementof theplunger 38. However, after this short period of slow movement, therotation of the carriers brings the chamber I09b directly in line withthe exhaust A passageway III and permits the accumulator t0 immediatelysnap back the piston 39 and its associated plunger 38 to their originalpositions. Viewed from Figure 4, the chamber I090 is closed off to theexhaust III immediately before it is opened to the pressure chamber 99a.

As shown, the lower end of, each piston chamber 4I is connected throughthe pipe 511 to an annular accumulator header II5'which, in turn, isconnected through suitable piping us to an accumulator chamber I IIwhich extends in} wardly and vertically along the rotary frame I3.

A suitable gauge I I8 has been provided. In order I to have a smoothlyacting rotary distributor core I04 which will not lock during certainperiods of its movement, I have provided suitable balancing dead-endslots I20, I2I, connected by passageways I22 and I23 to the pressurechain: ber 99a, see Figure 5. Drain passages I24, I25, I26 and I2'I areconnected to the exhaust chamber I I la. I have also provided anannularly extending drip trough I 28 connected by a drain pipe I29to aliquid return passage III in the valve base I09. i

operative position after a shape has been provided.

3. In a machine for making shaped articles, a support, carrier meansrotatably mounted on said support, mold cups on said carrier, a pressuremeans for each mold cup on said carrierfor shaping material therein,means on said carrier intermittently actuating each presser to shapematerial in each of said mold cups, valvular means on said support andhaving a portion rotatable with said carrier means, means providinghydraulic pressure for actuating each of said pressers, an operableconnection between said hydraulic pressure means and each of saidpressers, said valve being operably-positioned in such connectionbetween said hydraulic pressure means and each of said pressers, saidvalve being constructed and arranged and having another portion operablymounted with respect to said rotatable portion to intermittently supplyactuating pressure fluid to each presser during the rotative movement ofsaid rotatable portion with said carrier means.

l. In a machinefor making shaped articles, a support, carrier meansoperably mounted on said support, mold cups on said carrier means,pressers onsaid carrier, each of said pressers being constructed andarranged to shape material in one of said mold cups, presser cylinderson said carrier means, a piston mounted in each of said pressercylinders and connected to one of said pressers, means providinghydraulic pressure and being operably connected to said piston cylindersfor moving said pistons therein, valvular means for periodically cuttingoff flow of hydraulic fluid pressure from said hydraulic piston therein,means for continuously rotatingthe carrier, a pressure line opening intoone end pressure means to each of said piston chambers after a shape hasbeen formed in a mold cup by one of said pressers, said pistons beingconstructed and arranged to move said pressers to a shaping position andto thereafter shapematerial in said cups, and means energized by saidhydraulic pressure means for returning said pressers to originalinoperative positions after material has been shaped in said cups, andmeans for controlling the efiective counter action of said fluid forreturning said pressers and their associated pistons in a desiredmanner.

5. In a continuously moving machine for making shapes, a support frame,a carrier movably mounted on said support frame, means continuouslymoving said carrier on said support frame, mold cups on said carrier,blank-forming plungers for said mold cups, piston means operablyassociatedwith said plungers for actuating them, a primary meansproviding fluid pressure and being operably connected with respect tosaid pistons to move them in one direction, a secondary means providingfluid independently of said primary'means and being operably connectedwith respect to said pistons ,fp move them in an opposite direction,said secondary means also being constructed and arranged and operablyconnected with respect to said pistons in such a manner that it will beenergized by the movement of said pistons produced by said primarymeans, a distributor valve operably timed to the movement of said moldcups and having means controlling actuation of said pistons insuccession by said primary and secondary means.

6. Apparatus of the class described comprising a succession of hydraulicpress units mounted on a carrier, each unit including a cylinder with aof each cylinder, a counterpressure line openinginto the Other end ofeach cylinder, a distributing valve movable with the carrier for.successively connecting each of said pressure lineswith a source offluid pressure. and subsequently to anexhaust passage to first applypressure to. the piston and then relieve pressure in each cylinder inturn, and a common closed reservoir with which all said counterpressurelines communicate, said common reservoir being closed to re-' tain acompressible fluid under pressure whereby said reservoir serves as anaccumulator to effect the return stroke of the pistons as their pressurelines are successively opened to the exhaust passage.

,port and a turntable on the support, a, plurality of molds thereonspaced from one another at equal angles, means for continuously rotatingthe turntable, a plurality of individual press units on the turntable,each having a fluid pressure cylinder with a pressure pipe at one end, acounterpressure pipe at the other end of each cylinder, 2. pressuredistributing valve to which all the inlet pipes connect comprising anannulus that rotates with the turntable having a port for each inletpipe, and a fixed valve. member in the annulus having a pressure portand'an exhaust channel whereby the ports in the annulus suc-, cessivelymove past the pressure port and then the exhaust port, and a third portin said valve having a restricted passageway leading into said exhaustport whereby to break the. pressure in the cylinders before fullyopening them to exhaust, and a closed reservoir to which thecounterpressure pipes lead.

8. Glass molding apparatus comprising a support, a turntable on thesupport having a plurality of molds thereon spaced from one another atequal angles, a succession of press units on the turntable, there beingone press unit for each mold, means adjacent one portion of theperiphcry of the turntable for .feeding a charge of glass into each.mold in succession, said molds being radially movable on the tabletoward and away angles, a, press unit on the turntable for each mold,each press unit including a cylinder with. a piston therein, means forrotating the turntable,

a stationary valve member at the top of said column having pressureinlet and exhaust ports.

thereon, a rotary valve member on the turntable cooperating with thestationary one and having,

a port therein for each cylinder, each port being connected with itsrespective cylinder, a counterpressure passage leading from theoppositeend of each cylinder, and a closed reservoir having,

compressible fluid trapped therein mountedon the turntable with whichall of said pressure passages communicate.

EDWINE. SLICK.

counter-

